Year	Measure
1960	4251.43591
1961	4307.82075
1962	4451.56012
1963	4694.12007
1964	4903.60761
1965	5153.93241
1966	5272.6647
1967	5557.29174
1968	5871.52039
1969	6091.10001
1970	6476.38853
1971	6530.33556
1972	6933.60655
1973	7123.37922
1974	7100.54809
1975	7150.10681
1976	7272.55005
1977	7409.53001
1978	7538.84294
1979	7837.76966
1980	7804.2201
1981	7530.94526
1982	7149.34406
1983	7051.62956
1984	7341.51922
1985	7439.34207
1986	7492.11338
1987	7641.32411
1988	7854.97204
1989	7933.56708
1990	7602.67493
1991	7481.50384
1992	7562.14813
1993	7730.48665
1994	7926.83925
1995	7965.84677
1996	8036.71332
1997	8034.41478
1998	7924.03092
1999	8081.48696
2000	8242.52466
2001	8040.5389
2002	7993.38974
2003	8332.92385
2004	8441.18487
2005	8404.24591
2006	8240.11562
2007	8213.66351
2008	8195.21231
2009	7797.19626
2010	7788.47261
2011	7910.75935
2012	7725.32831
2013	7728.43407
2014	7876.09411
2015	7603.73926