Year	Percent
1990	50.022
1991	50.324
1992	50.584
1993	50.812
1994	50.973
1995	51.072
1996	51.225
1997	51.365
1998	51.364
1999	51.257
2000	51.101
2001	50.98
2002	50.868
2003	50.734
2004	50.669
2005	50.709
2006	50.908
2007	51.148
2008	51.698
2009	52.131
2010	52.461
2011	52.909
2012	53.315
2013	53.27
2014	53.187
2015	53.084
2016	52.974
2017	52.996
2018	53.03
2019	53.076
2020	53.135
2021	53.227
2022	53.326
2023	53.415
2024	53.478
2025	53.502
2026	53.535
2027	53.54
2028	53.538
2029	53.551
2030	53.601