Year	Percent
1991	7.559
1992	7.697
1993	7.782
1994	7.799
1995	7.856
1996	8.013
1997	8.08
1998	8.642
1999	9.211
2000	9.777
2001	10.419
2002	11.095
2003	11.898
2004	12.641
2005	13.48
2006	14.471
2007	15.507
2008	16.475
2009	16.293
2010	16.162
2011	16.065
2012	16.037
2013	16.088
2014	16.098
2015	16.182
2016	16.287
2017	16.506
2018	16.734
2019	16.962
2020	17.174
2021	17.381
2022	17.583