Year	Percent
1990	3.17
1991	3.06
1992	3.16
1993	3.13
1994	2.43
1995	3.01
1996	3.17
1997	3.2
1998	3
1999	2.77
2000	2.96
2001	2.95
2002	3.03
2003	3.33
2004	3.06
2005	3.26
2006	3.74
2007	4.08
2008	4.35
2009	4.1
2010	4.38
2011	4.55
2012	4.47
2013	4.91
2014	5.01
2015	5.61
2016	5.82
2017	5.914
2018	6.008
2019	6.101
2020	6.195
2021	6.289
2022	6.383
2023	6.477
2024	6.57
2025	6.664
2026	6.758
2027	6.852
2028	6.946
2029	7.039
2030	7.133