Year	Percent
1979	146.42565
1980	205.30629
1981	245.61172
1982	72.96887
1983	87.34231
1984	62.05188
1985	57.83827
1986	89.5026
1987	85.54468
1988	94.76874
1989	118.08116
1990	94.78998
1991	104.65967
1992	93.82087
1993	218.76296
1994	181.74643
1995	168.39711
1996	155.64078
1997	104.26699
1998	110.82638
1999	223.66272
2000	159.47004
2001	129.57051
2002	110.38088
2003	153.09333
2004	190.47036
2005	201.96549
2006	260.00919
2007	299.57371
2008	137.84533
2009	250.11732
2010	273.75921
2011	216.79145
2012	263.20854
2013	244.50736
2014	241.64865
2015	210.44414
2016	206.74701
2017	243.04963