Year	Number
1975	258.6206896552
1976	270.8620689655
1977	283.1034482759
1978	295.3448275862
1979	307.5862068966
1980	319.8275862069
1981	332.0689655172
1982	344.3103448276
1983	356.5517241379
1984	368.7931034483
1985	381.0344827586
1986	393.275862069
1987	405.5172413793
1988	417.7586206897
1989	430
1990	330.1724137931
1991	327.7586206897
1992	325.3448275862
1993	322.9310344828
1994	277.0689655172
1995	277.9885057471
1996	278.908045977
1997	279.8275862069
1998	280.7471264368
1999	281.6666666667
2000	282.5862068966
2001	300.8965517241
2002	321.9655172414
2003	341.6551724138
2004	361.3448275862
2005	374.1379310345
2006	381.2931034483
2007	388.4482758621
2008	395.6034482759
2009	402.7586206897
2010	409.9137931034
2011	417.0689655172
2012	424.224137931
2013	431.3793103448
2014	434.6551724138
2015	431.0344827586
2016	432.4137931034
2017	431.0344827586
2018	431.0344827586
2019	431.0344827586
2020	431.0344827586