Year	Percent
1990	48.043
1991	48.027
1992	48.554
1993	48.727
1994	49.375
1995	49.437
1996	50.031
1997	50.025
1998	50.152
1999	50.755
2000	50.917
2001	51.156
2002	51.798
2003	52.59
2004	53.486
2005	54.106
2006	54.946
2007	55.939
2008	56.268
2009	56.35
2010	56.784
2011	57.121
2012	57.645
2013	58.11
2014	58.451
2015	58.942
2016	59.161
2017	59.337
2018	59.588
2019	59.873
2020	60.161
2021	60.464
2022	60.782
2023	61.092
2024	61.359
2025	61.563
2026	61.703
2027	61.768
2028	61.769
2029	61.73
2030	61.67