Year	Percent
1990	36.123
1991	36.077
1992	36.048
1993	36.04
1994	36.062
1995	36.13
1996	36.349
1997	36.621
1998	36.95
1999	37.299
2000	37.602
2001	37.849
2002	38.077
2003	38.329
2004	38.545
2005	38.78
2006	39.075
2007	39.319
2008	39.601
2009	39.819
2010	40.051
2011	40.329
2012	40.572
2013	40.802
2014	41.015
2015	41.181
2016	41.329
2017	41.306
2018	41.243
2019	41.179
2020	41.127
2021	41.123
2022	41.137
2023	41.161
2024	41.196
2025	41.23
2026	41.298
2027	41.376
2028	41.461
2029	41.551
2030	41.647