Year	Percent
1990	35.58
1991	35.943
1992	36.773
1993	37.571
1994	38.342
1995	39.114
1996	39.983
1997	40.848
1998	41.703
1999	42.535
2000	43.336
2001	44.191
2002	45.122
2003	46.077
2004	47.061
2005	48.078
2006	49.051
2007	50.08
2008	51.152
2009	52.251
2010	53.357
2011	52.87
2012	52.908
2013	52.93
2014	52.937
2015	52.931
2016	53.265
2017	53.577
2018	53.954
2019	54.354
2020	54.725
2021	54.844
2022	54.972
2023	55.133
2024	55.345
2025	55.598
2026	55.837
2027	56.107
2028	56.409
2029	56.739
2030	57.086