Year	Percent
1990	23.111
1991	23.193
1992	23.357
1993	23.601
1994	23.921
1995	24.315
1996	24.703
1997	25.171
1998	25.684
1999	26.19
2000	26.658
2001	26.979
2002	27.276
2003	27.545
2004	27.79
2005	28.027
2006	28.107
2007	28.568
2008	29.039
2009	29.516
2010	29.999
2011	30.467
2012	30.941
2013	31.422
2014	31.91
2015	32.403
2016	32.89
2017	33.037
2018	33.185
2019	33.332
2020	33.474
2021	33.601
2022	33.725
2023	33.844
2024	33.952
2025	34.045
2026	34.118
2027	34.179
2028	34.231
2029	34.277
2030	34.318