Year	Percent
1990	4.049
1991	4.426
1992	4.836
1993	5.282
1994	5.766
1995	6.292
1996	6.863
1997	7.481
1998	8.15
1999	8.873
2000	9.654
2001	10.495
2002	11.275
2003	10.785
2004	10.555
2005	10.92
2006	11.295
2007	10.965
2008	10.481
2009	10.015
2010	8.898
2011	7.895
2012	8.15
2013	7.78
2014	7.63
2015	7.91
2016	7.66
2017	7.481
2018	7.303
2019	7.124
2020	6.946
2021	6.767
2022	6.589
2023	6.41
2024	6.232
2025	6.053
2026	5.875
2027	5.696
2028	5.517
2029	5.339
2030	5.16