Year	Percent
1990	4.153
1991	4.568
1992	4.275
1993	4.466
1994	4.543
1995	4.008
1996	4.421
1997	4.807
1998	4.552
1999	4.47
2000	4.47
2001	4.49
2002	3.91
2003	4.65
2004	4.88
2005	4.75
2006	4.4
2007	4.47
2008	4.5
2009	6.62
2010	6.31
2011	5.81
2012	4.94
2013	3.94
2014	3.72
2015	3.94
2016	4
2017	4.029
2018	4.059
2019	4.088
2020	4.118
2021	4.147
2022	4.177
2023	4.206
2024	4.236
2025	4.265
2026	4.295
2027	4.324
2028	4.354
2029	4.383
2030	4.412