Year	Percent
1988	122.12687
1989	137.91118
1990	157.91378
1991	137.41795
1992	151.01606
1993	165.28636
1994	165.83002
1995	143.74861
1996	114.27651
1997	93.93089
1998	81.2063
1999	82.32417
2000	71.46233
2001	64.68679
2002	66.71597
2003	63.72852
2004	68.49023
2005	50.67925
2006	22.03718
2007	23.70201
2008	22.21403
2009	27.1798
2010	28.61574
2011	29.78327
2012	30.09141
2013	29.91857
2014	30.10257
2015	34.55678
2016	35.2824