| 1975: | 24.523 | 1985: | 23.739 | 1995: | 25.720 | 2005 | 25.330 | 2015: | 22.647 | ||||
| 1976: | 24.474 | 1986: | 23.844 | 1996: | 25.750 | 2006: | 25.040 | 2016: | 22.676 | ||||
| 1977: | 24.514 | 1987: | 23.923 | 1997: | 25.989 | 2007: | 24.810 | 2017: | 22.573 | ||||
| 1978: | 24.394 | 1988: | 24.078 | 1998: | 25.928 | 2008: | 24.414 | 2018: | 22.340 | ||||
| 1979: | 24.295 | 1989: | 24.619 | 1999: | 25.942 | 2009: | 24.085 | 2019: | 22.153 | ||||
| 1980: | 24.441 | 1990: | 24.987 | 2000: | 25.852 | 2010: | 22.758 | 2020: | 22.224 | ||||
| 1981: | 24.480 | 1991: | 25.057 | 2001: | 25.772 | 2011: | 22.538 | 2021: | 22.222 | ||||
| 1982: | 24.154 | 1992: | 25.323 | 2002: | 25.691 | 2012: | 22.383 | 2022: | 22.476 | ||||
| 1983: | 23.849 | 1993: | 25.391 | 2003: | 25.517 | 2013: | 22.195 | 2023: | 22.434 | ||||
| 1984: | 23.653 | 1994: | 25.546 | 2004: | 25.499 | 2014: | 22.301 |