Year	Percent
1990	24.635
1991	24.573
1992	24.493
1993	24.356
1994	24.24
1995	24.439
1996	24.639
1997	24.84
1998	25.803
1999	26.79
2000	27.801
2001	28.246
2002	28.696
2003	29.151
2004	29.609
2005	30.071
2006	30.538
2007	31.009
2008	31.483
2009	31.962
2010	32.444
2011	32.93
2012	33.42
2013	33.913
2014	34.41
2015	34.328
2016	34.25
2017	34.447
2018	34.644
2019	34.842
2020	35.039
2021	35.236
2022	35.434
2023	35.631
2024	35.828
2025	36.026
2026	36.223
2027	36.421
2028	36.618
2029	36.815
2030	37.013