Year	Measure
1960	3082.71156
1961	2916.70623
1962	3028.29837
1963	3279.60227
1964	3306.81596
1965	3444.55135
1966	3639.77093
1967	3594.36179
1968	3924.13444
1969	3553.47669
1970	4231.9921
1971	4378.31032
1972	4403.96965
1973	5268.96574
1974	5132.19707
1975	5071.63534
1976	5085.581
1977	5602.87017
1978	5710.71008
1979	6515.05969
1980	6560.99817
1981	7178.86936
1982	7076.20799
1983	7254.28628
1984	7531.26996
1985	7334.90193
1986	7605.56378
1987	7857.45488
1988	7882.47377
1989	7983.03751
1990	8907.79198
1991	8054.35672
1992	7755.39442
1993	8249.53645
1994	8293.41293
1995	8255.76891
1996	8847.78518
1997	8584.1005
1998	9036.6543
1999	10038.31192
2000	11091.54887
2001	10589.46619
2002	10804.64172
2003	10731.32864
2004	10524.2507
2005	10524.8775
2006	12734.00662
2007	14746.03134
2008	16353.83127
2009	16911.07978
2010	17023.16682
2011	18157.5981
2012	17630.07147
2013	18178.13901
2014	17916.12042
2015	17478.89304