Year	Percent
1990	5.097
1991	5.043
1992	4.985
1993	4.931
1994	4.878
1995	4.825
1996	4.786
1997	4.744
1998	4.699
1999	4.656
2000	4.616
2001	4.588
2002	4.56
2003	4.529
2004	4.502
2005	4.478
2006	4.462
2007	4.447
2008	4.43
2009	4.02
2010	4.09
2011	3.39
2012	2.73
2013	3.8
2014	4.2
2015	4.46
2016	3.77
2017	3.717
2018	3.663
2019	3.61
2020	3.557
2021	3.503
2022	3.45
2023	3.397
2024	3.343
2025	3.29
2026	3.237
2027	3.184
2028	3.13
2029	3.077
2030	3.024