Year	Number
1990	68.5063113604
1991	70.7795231417
1992	73.0527349229
1993	75.3259467041
1994	77.5991584853
1995	79.8723702665
1996	82.1455820477
1997	84.4187938289
1998	86.6920056101
1999	88.9652173913
2000	91.2384291725
2001	91.147826087
2002	91.0572230014
2003	90.9666199158
2004	90.8760168303
2005	90.7854137447
2006	90.7854137447
2007	90.7854137447
2008	90.7854137447
2009	90.7854137447
2010	90.7854137447
2011	90.7854137447
2012	90.7854137447
2013	90.7854137447
2014	90.7854137447
2015	90.7854137447
2016	90.7854137447
2017	90.7854137447
2018	90.7854137447
2019	90.7854137447
2020	90.7854137447