Year	Percent
1990	11.281
1991	11.617
1992	11.988
1993	12.322
1994	12.664
1995	13.021
1996	13.086
1997	13.157
1998	13.231
1999	13.313
2000	13.41
2001	12.973
2002	13.625
2003	12.567
2004	12.728
2005	12.894
2006	13.281
2007	16.066
2008	15.656
2009	16.48
2010	16.264
2011	16.206
2012	15.79
2013	14.768
2014	14.777
2015	14.809
2016	14.815
2017	14.886
2018	14.954
2019	15.018
2020	15.078
2021	15.134
2022	15.185
2023	15.233
2024	15.28
2025	15.326
2026	15.38
2027	15.435
2028	15.493
2029	15.56
2030	15.638