Year	Percent
1990	10.587
1991	10.93
1992	11.305
1993	11.641
1994	11.983
1995	12.336
1996	12.397
1997	12.465
1998	12.536
1999	12.614
2000	12.707
2001	12.298
2002	12.903
2003	11.902
2004	12.049
2005	12.201
2006	12.543
2007	15.157
2008	14.753
2009	15.504
2010	15.289
2011	15.226
2012	14.833
2013	13.864
2014	13.869
2015	13.894
2016	13.896
2017	13.959
2018	14.018
2019	14.071
2020	14.117
2021	14.155
2022	14.187
2023	14.213
2024	14.234
2025	14.251
2026	14.269
2027	14.285
2028	14.301
2029	14.321
2030	14.348