Year	Percent
1990	7.322
1991	7.889
1992	8.037
1993	8.06
1994	6.56
1995	5.39
1996	3.19
1997	2.32
1998	2.5
1999	2.53
2000	2.78
2001	1.9
2002	2.23
2003	2.54
2004	2.68
2005	2.62
2006	2.67
2007	2.96
2008	3.02
2009	3.13
2010	2.96
2011	3.37
2012	3.36
2013	3.13
2014	2.85
2015	3.04
2016	3.8
2017	3.835
2018	3.87
2019	3.905
2020	3.941
2021	3.976
2022	4.011
2023	4.046
2024	4.081
2025	4.116
2026	4.152
2027	4.187
2028	4.222
2029	4.257
2030	4.292