Year	Percent
1990	32.349
1991	32.27
1992	32.351
1993	32.41
1994	32.41
1995	32.512
1996	32.562
1997	32.674
1998	32.781
1999	32.921
2000	33.173
2001	33.33
2002	33.517
2003	33.725
2004	33.948
2005	34.188
2006	34.401
2007	34.613
2008	34.831
2009	35.071
2010	35.318
2011	35.538
2012	35.773
2013	36.021
2014	36.266
2015	36.511
2016	36.739
2017	36.949
2018	37.158
2019	37.362
2020	37.56
2021	37.748
2022	37.93
2023	38.108
2024	38.281
2025	38.447
2026	38.604
2027	38.757
2028	38.91
2029	39.071
2030	39.242