Year	Percent change
1986	30.698
1987	55.027
1988	66.227
1989	64.267
1990	60.425
1991	71.132
1992	65.967
1993	71.076
1994	115.7
1995	76.25
1996	80.142
1997	99.016
1998	69.634
1999	68.805
2000	38.998
2001	68.489
2002	29.705
2003	18.403
2004	9.353
2005	7.717
2006	9.653
2007	8.387
2008	10.064
2009	6.526
2010	6.401
2011	10.448
2012	6.164
2013	7.4
2014	8.17
2015	8.808
2016	8.533
2017	11.92
2018	20.302
2019	15.5
2020	14
2021	13
2022	13.001
2023	13.001
2024	12