Year	Percent
1990	49.332
1991	49.278
1992	50.724
1993	50.533
1994	50.52
1995	50.961
1996	50.847
1997	51.218
1998	51.068
1999	51.26
2000	51.023
2001	51.84
2002	50.571
2003	50.276
2004	52.6
2005	52.942
2006	53.283
2007	53.624
2008	53.965
2009	54.305
2010	54.645
2011	54.984
2012	55.323
2013	55.662
2014	56
2015	57.822
2016	57.274
2017	57.502
2018	57.73
2019	57.957
2020	58.185
2021	58.413
2022	58.641
2023	58.869
2024	59.097
2025	59.325
2026	59.552
2027	59.78
2028	60.008
2029	60.236
2030	60.464