Year	Percent
1990	2.434
1991	2.584
1992	2.78
1993	3.116
1994	3.832
1995	4.261
1996	4.65
1997	4.742
1998	4.787
1999	4.754
2000	4.47
2001	4.096
2002	3.887
2003	3.58
2004	3.246
2005	3.161
2006	2.981
2007	2.807
2008	2.751
2009	3.085
2010	2.982
2011	2.859
2012	2.849
2013	2.845
2014	2.869
2015	3.092
2016	3.028
2017	2.946
2018	2.864
2019	2.782
2020	2.7
2021	2.619
2022	2.537
2023	2.455
2024	2.373
2025	2.291
2026	2.209
2027	2.127
2028	2.045
2029	1.963
2030	1.881