Year	Percent
1990	4.043
1991	4.011
1992	3.996
1993	3.989
1994	3.978
1995	3.96
1996	4.048
1997	4.139
1998	4.231
1999	4.325
2000	4.422
2001	4.52
2002	4.195
2003	3.892
2004	3.61
2005	4.14
2006	3.69
2007	3.41
2008	3.56
2009	3.302
2010	3.063
2011	2.84
2012	4.28
2013	4.447
2014	4.62
2015	4.8
2016	5.8
2017	5.744
2018	5.688
2019	5.632
2020	5.576
2021	5.52
2022	5.464
2023	5.408
2024	5.352
2025	5.296
2026	5.24
2027	5.184
2028	5.128
2029	5.072
2030	5.016