Year	Percent
1990	9.828
1991	9.852
1992	9.98
1993	10.124
1994	10.285
1995	10.463
1996	10.66
1997	11.395
1998	12.176
1999	13.011
2000	13.909
2001	14.851
2002	15.864
2003	16.957
2004	18.136
2005	19.41
2006	18.492
2007	17.669
2008	15.486
2009	16.364
2010	15.946
2011	15.326
2012	14.744
2013	14.197
2014	13.68
2015	15.153
2016	17.079
2017	16.843
2018	16.576
2019	16.285
2020	15.974
2021	15.648
2022	15.303
2023	14.943
2024	14.574
2025	14.2
2026	13.83
2027	13.457
2028	13.082
2029	12.708
2030	12.337