Year	Percent
1990	16.573
1991	16.573
1992	16.548
1993	16.764
1994	17.1
1995	17.617
1996	18.147
1997	18.688
1998	19.243
1999	19.809
2000	20.388
2001	20.98
2002	21.584
2003	22.2
2004	22.829
2005	23.471
2006	24.125
2007	24.791
2008	25.469
2009	26.16
2010	23.5
2011	22.57
2012	29.78
2013	25.93
2014	23.03
2015	22.28
2016	20.76
2017	21.174
2018	21.587
2019	22.001
2020	22.414
2021	22.828
2022	23.242
2023	23.655
2024	24.069
2025	24.482
2026	24.896
2027	25.31
2028	25.723
2029	26.137
2030	26.55