Year	Percent
1990	40.34
1991	40.225
1992	40.29
1993	40.505
1994	40.829
1995	41.288
1996	41.887
1997	42.547
1998	43.296
1999	44.177
2000	45.168
2001	45.879
2002	46.618
2003	47.357
2004	48.008
2005	48.604
2006	49.473
2007	50.295
2008	51.086
2009	51.815
2010	52.496
2011	53.087
2012	53.703
2013	54.311
2014	54.836
2015	55.29
2016	55.643
2017	55.948
2018	56.253
2019	56.555
2020	56.852
2021	57.143
2022	57.43
2023	57.71
2024	57.98
2025	58.237
2026	58.483
2027	58.72
2028	58.948
2029	59.17
2030	59.387