Good catch. My quick analysis looked at the previous 9 years.
Edit: Here's the updated table. Interesting to see the '30s, '50s, '70s, and '90s in here - every 20 years being represented until you get into the 2000s, when it skips to the 2020s.
2022-23: 9.14
1976-77: 11.44
1955-56: 12.01
1954-55: 12.13
1994-95: 12.71
1975-76: 12.86
1931-32: 13.79
1974-75: 13.87
1953-54: 14.03
1956-57: 14.11
2021-22: 14.13
1952-53: 14.46
1993-94: 14.46
1977-78: 14.49
1932-33: 14.81
1973-74: 15.47
1991-92: 15.76
1930-31: 15.93
2020-21: 16.17
1951-52: 16.50