Year	Percent
1990	7.473
1991	7.506
1992	7.536
1993	7.519
1994	7.531
1995	7.417
1996	7.278
1997	7.209
1998	7.235
1999	7.308
2000	7.253
2001	7.241
2002	7.309
2003	7.276
2004	7.17
2005	7.158
2006	7.188
2007	7.171
2008	7.22
2009	7.423
2010	7.493
2011	7.287
2012	7.331
2013	7.348
2014	7.392
2015	7.451
2016	7.511
2017	7.521
2018	7.53
2019	7.54
2020	7.549
2021	7.558
2022	7.568
2023	7.577
2024	7.587
2025	7.596
2026	7.606
2027	7.615
2028	7.625
2029	7.634
2030	7.643