In 2003, there were 44 pitchers that threw at least 200 innings, 61 at least 190, 79 at least 180
In 2013, there were 34 pitchers that threw at least 200 innings, 49 at least 190, 64 at least 180
In 2023, there were 5 pitchers that threw at least 200 innings, 14 at least 190, 24 at least 180
So it was trending, but it's fallen off of a cliff.
Between 1988 and 2008, Greg Maddux threw at least 194 innings, each year, for 21 consecutive seasons. Would Maddux not be allowed to pitch now the way he pitched then because pitching philosophy has changed so much? It make no sense to me.
I played with some numbers to look a little farther back:
In 1993, there were 49 pitchers that threw at least 200 innings, 56 at least 190, 65 at least 180. That was little changed from 10 years earlier.
In 1983, there were 49 pitchers that threw at least 200 innings, 57 at least 190, 65 at least 180.
In 1973, there were 61 pitchers that threw at least 200 innings, 67 at least 190, 74 at least 180.
Also in 1973, there were 32 pitchers that threw at least 250 innings and 7 pitchers that threw at least 300 innings (Steve Carlton in 1980 was the last pitcher to throw 300 innings).
Between 1973 and 1980, there were 28 pitchers that threw 300 innings. None of them had a career less than 9 years and only 2 were under 10 years.
Workhorse pitchers:
1973,Minnesota Twins,Bert Blyleven,20 wins,325.00 Innings Pitched,22.33 Year-Career
1973,Milwaukee Brewers,Jim Colborn,20 wins,314.33 Innings Pitched,9.22 Year-Career
1973,Detroit Tigers,Mickey Lolich,16 wins,308.67 Innings Pitched,16.37 Year-Career
1973,Cleveland Indians,Gaylord Perry,19 wins,344.00 Innings Pitched,21.44 Year-Career
1973,California Angels,Nolan Ryan,21 wins,326.00 Innings Pitched,27.03 Year-Career
1973,California Angels,Bill Singer,20 wins,315.67 Innings Pitched,12.81 Year-Career
1973,Chicago White Sox,Wilbur Wood,24 wins,359.33 Innings Pitched,17.14 Year-Career
1974,Oakland Athletics,Catfish Hunter,25 wins,318.33 Innings Pitched,14.35 Year-Career
1974,Texas Rangers,Fergie Jenkins,25 wins,328.33 Innings Pitched,18.04 Year-Career
1974,Detroit Tigers,Mickey Lolich,16 wins,308.00 Innings Pitched,16.37 Year-Career
1974,Atlanta Braves,Phil Niekro,20 wins,302.33 Innings Pitched,23.45 Year-Career
1974,Cleveland Indians,Gaylord Perry,21 wins,322.33 Innings Pitched,21.44 Year-Career
1974,California Angels,Nolan Ryan,22 wins,332.67 Innings Pitched,27.03 Year-Career
1974,Boston Red Sox,Luis Tiant,22 wins,311.33 Innings Pitched,18.13 Year-Career
1974,Chicago White Sox,Wilbur Wood,20 wins,320.33 Innings Pitched,17.14 Year-Career
1975,New York Yankees,Catfish Hunter,23 wins,328.00 Innings Pitched,14.35 Year-Career
1975,Chicago White Sox,Jim Kaat,20 wins,303.67 Innings Pitched,23.91 Year-Career
1975,Los Angeles Dodgers,Andy Messersmith,19 wins,321.67 Innings Pitched,10.91 Year-Career
1975,Baltimore Orioles,Jim Palmer,23 wins,323.00 Innings Pitched,19.07 Year-Career
1976,San Diego Padres,Randy Jones,22 wins,315.33 Innings Pitched,9.23 Year-Career
1976,Baltimore Orioles,Jim Palmer,22 wins,315.00 Innings Pitched,19.07 Year-Career
1977,Minnesota Twins,Dave Goltz,20 wins,303.00 Innings Pitched,10.93 Year-Career
1977,Atlanta Braves,Phil Niekro,16 wins,330.33 Innings Pitched,23.45 Year-Career
1977,Baltimore Orioles,Jim Palmer,20 wins,319.00 Innings Pitched,19.07 Year-Career
1977,Montreal Expos,Steve Rogers,17 wins,301.67 Innings Pitched,11.84 Year-Career
1978,Atlanta Braves,Phil Niekro,19 wins,334.33 Innings Pitched,23.45 Year-Career
1979,Atlanta Braves,Phil Niekro,21 wins,342.00 Innings Pitched,23.45 Year-Career
1980,Philadelphia Phillies,Steve Carlton,24 wins,304.00 Innings Pitched,23.03 Year-Career