Year	Percent
1990	22.982
1991	23.039
1992	23.125
1993	23.3
1994	23.334
1995	23.498
1996	23.694
1997	23.943
1998	24.157
1999	24.515
2000	24.719
2001	25.177
2002	25.584
2003	26.049
2004	26.473
2005	26.912
2006	27.097
2007	27.239
2008	27.489
2009	27.883
2010	28.098
2011	28.241
2012	28.354
2013	28.444
2014	28.502
2015	28.537
2016	28.634
2017	28.773
2018	28.907
2019	29.038
2020	29.169
2021	29.272
2022	29.375
2023	29.477
2024	29.575
2025	29.665
2026	29.726
2027	29.782
2028	29.837
2029	29.898
2030	29.966