Year	Percent
1990	13.442
1991	13.806
1992	14.943
1993	15.646
1994	16.769
1995	17.149
1996	17.472
1997	17.328
1998	17.821
1999	17.216
2000	16.339
2001	15.887
2002	15.474
2003	14.892
2004	14.35
2005	13.886
2006	13.338
2007	12.807
2008	12.494
2009	12.995
2010	12.724
2011	13.998
2012	14.049
2013	14.321
2014	13.918
2015	14.612
2016	14.633
2017	14.493
2018	14.354
2019	14.215
2020	14.075
2021	13.936
2022	13.797
2023	13.657
2024	13.518
2025	13.379
2026	13.24
2027	13.1
2028	12.961
2029	12.822
2030	12.682