Year	%
1990	32.8125
1991	34.5195729537367
1992	36.1959654178674
1993	37.572463768116
1994	38.7522191224956
1995	39.7397769516729
1996	40.5767844268205
1997	41.345600920069
1998	41.9927429636167
1999	42.5617662519713
2000	43.1049644256136
2001	43.5600030323706
2002	43.99201891812
2003	44.3602318323674
2004	44.7132413897053
2005	45.0730350104336
2006	45.5031867180738
2007	46.008860249698
2008	46.4923891462608
2009	46.9469554835408
2010	47.3693487265356
2011	47.7457704618198
2012	48.0965909090909
2013	48.4242662989955
2014	48.8105004101723
2015	49.1536250399233
2016	49.4085129906026
2017	49.8223902830297
2018	50.3787878787879
2019	50.8582638548308
2020	51.2846733989518
2021	51.6034206306788
2022	51.8948398825339