Year	Percent
1988	31.85025
1989	87.02761
1990	169.36936
1991	258.31536
1992	163.16042
1993	92.6935
1994	79.5166
1995	72.60833
1996	92.45441
1997	30.69161
1998	42.14676
1999	37.30007
2000	36.87013
2001	63.76651
2002	35.50182
2003	62.26097
2004	79.07071
2005	40.11212
2006	32.64775
2007	31.40519
2008	23.19451
2009	34.3543
2010	23.49517
2011	17.71844
2012	16.29807
2013	14.6071
2014	12.59618
2015	10.7229
2016	10.39688
2017	13.64142
2018	11.28481
2019	17.13919
2020	18.68906
2021	22.79523