Year	Percent
1990	2.497
1991	2.703
1992	2.796
1993	2.786
1994	2.74
1995	2.628
1996	2.543
1997	2.534
1998	2.451
1999	2.611
2000	2.555
2001	2.543
2002	2.519
2003	2.485
2004	2.42
2005	2.36
2006	2.11
2007	1.885
2008	1.685
2009	1.505
2010	1.344
2011	1.2
2012	2.19
2013	2.15
2014	2.131
2015	2.097
2016	2.073
2017	2.024
2018	1.976
2019	1.927
2020	1.879
2021	1.83
2022	1.782
2023	1.733
2024	1.685
2025	1.636
2026	1.588
2027	1.539
2028	1.491
2029	1.442
2030	1.394