Year	Percent
1990	27.785
1991	27.865
1992	27.986
1993	28.22
1994	28.275
1995	28.476
1996	28.785
1997	29.136
1998	29.416
1999	29.842
2000	30.056
2001	30.51
2002	30.87
2003	31.281
2004	31.636
2005	32.008
2006	32.21
2007	32.36
2008	32.631
2009	33.06
2010	33.264
2011	33.405
2012	33.496
2013	33.549
2014	33.564
2015	33.562
2016	33.667
2017	33.816
2018	33.965
2019	34.114
2020	34.264
2021	34.415
2022	34.567
2023	34.72
2024	34.873
2025	35.026
2026	35.181
2027	35.336
2028	35.491
2029	35.645
2030	35.799