Year	Percent
1990	14.199
1991	14.156
1992	14.122
1993	14.08
1994	14.124
1995	14.164
1996	14.167
1997	14.22
1998	14.33
1999	14.405
2000	14.553
2001	14.716
2002	14.835
2003	17.029
2004	19.477
2005	20.105
2006	20.76
2007	21.282
2008	21.842
2009	21.935
2010	21.267
2011	23.635
2012	25.031
2013	25.555
2014	26.073
2015	26.615
2016	26.839
2017	27.044
2018	27.25
2019	27.448
2020	27.635
2021	27.812
2022	27.98
2023	28.139
2024	28.287
2025	28.427
2026	28.559
2027	28.682
2028	28.801
2029	28.923
2030	29.052