Year	Percent
1990	8.59
1991	8.653
1992	8.723
1993	8.791
1994	8.861
1995	8.933
1996	9.02
1997	9.107
1998	9.728
1999	10.387
2000	11.085
2001	11.822
2002	12.596
2003	13.406
2004	14.253
2005	15.328
2006	16.491
2007	17.74
2008	19.079
2009	19.082
2010	19.1
2011	19.156
2012	19.254
2013	19.319
2014	19.349
2015	19.409
2016	19.498
2017	19.782
2018	20.066
2019	20.34
2020	20.599
2021	20.849
2022	21.088
2023	21.321
2024	21.55
2025	21.777
2026	22.003
2027	22.226
2028	22.451
2029	22.682
2030	22.924