Year	Percent
1990	10.621
1991	10.735
1992	10.9
1993	11.057
1994	11.251
1995	11.514
1996	11.785
1997	12.258
1998	12.753
1999	13.276
2000	13.831
2001	14.413
2002	15.023
2003	15.661
2004	16.324
2005	17.016
2006	17.733
2007	18.484
2008	19.268
2009	20.078
2010	20.1
2011	21.245
2012	22.441
2013	23.631
2014	21.723
2015	21.502
2016	21.291
2017	21.486
2018	21.674
2019	21.849
2020	22.009
2021	22.158
2022	22.296
2023	22.428
2024	22.559
2025	22.694
2026	22.834
2027	22.975
2028	23.129
2029	23.307
2030	23.519