Year	Percent
1990	4.725
1991	4.751
1992	5.1
1993	5.667
1994	4.411
1995	4.512
1996	5.143
1997	4.861
1998	4.593
1999	4.34
2000	4.1
2001	4.112
2002	4.123
2003	4.135
2004	4.147
2005	4.158
2006	4.17
2007	4.182
2008	4.194
2009	4.206
2010	4.9
2011	6.4
2012	5.6
2013	6.9
2014	6.1
2015	7.8
2016	8.5
2017	8.545
2018	8.589
2019	8.634
2020	8.678
2021	8.723
2022	8.767
2023	8.812
2024	8.856
2025	8.901
2026	8.945
2027	8.99
2028	9.034
2029	9.079
2030	9.123