Year	Percent
1990	3.6
1991	3.4
1992	3.44
1993	3.53
1994	3.42
1995	3.35
1996	3.38
1997	3.61
1998	3.53
1999	3.4
2000	3.31
2001	3.43
2002	3.81
2003	4.28
2004	4.48
2005	4.98
2006	5.2
2007	5.62
2008	6.71
2009	6.68
2010	7.45
2011	7.98
2012	8.73
2013	9.12
2014	9.36
2015	9.54
2016	10.15
2017	10.328
2018	10.507
2019	10.685
2020	10.864
2021	11.042
2022	11.221
2023	11.399
2024	11.577
2025	11.756
2026	11.934
2027	12.113
2028	12.291
2029	12.469
2030	12.648