Year	Percent
1990	31.557
1991	31.481
1992	31.562
1993	31.62
1994	31.62
1995	31.72
1996	31.765
1997	31.872
1998	31.974
1999	32.108
2000	32.351
2001	32.498
2002	32.675
2003	32.873
2004	33.087
2005	33.318
2006	33.52
2007	33.719
2008	33.927
2009	34.159
2010	34.401
2011	34.613
2012	34.843
2013	35.086
2014	35.322
2015	35.555
2016	35.762
2017	35.95
2018	36.133
2019	36.311
2020	36.481
2021	36.636
2022	36.785
2023	36.931
2024	37.071
2025	37.206
2026	37.328
2027	37.448
2028	37.569
2029	37.697
2030	37.835