Year	Percent
1990	4.558
1991	4.837
1992	5.191
1993	5.772
1994	6.925
1995	7.574
1996	8.139
1997	8.27
1998	8.334
1999	8.288
2000	7.88
2001	7.328
2002	7.01
2003	6.53
2004	5.988
2005	5.847
2006	5.541
2007	5.238
2008	5.139
2009	5.719
2010	5.543
2011	5.331
2012	5.313
2013	5.306
2014	5.348
2015	5.731
2016	5.622
2017	5.471
2018	5.32
2019	5.169
2020	5.018
2021	4.867
2022	4.715
2023	4.564
2024	4.413
2025	4.262
2026	4.111
2027	3.96
2028	3.808
2029	3.657
2030	3.506