Year	Percent
1990	47.333
1991	47.972
1992	48.526
1993	49.099
1994	49.813
1995	50.405
1996	50.93
1997	51.275
1998	54.942
1999	55.089
2000	55.239
2001	55.391
2002	55.539
2003	57.34
2004	57.364
2005	57.413
2006	58.726
2007	57.711
2008	56.671
2009	55.601
2010	52.749
2011	51.714
2012	53.109
2013	52.276
2014	51.236
2015	54.991
2016	58.671
2017	58.393
2018	58.121
2019	57.842
2020	57.553
2021	57.256
2022	56.95
2023	56.637
2024	56.323
2025	56.009
2026	55.697
2027	55.386
2028	55.077
2029	54.771
2030	54.471