Year	Measure
1971	1753.53285
1972	1675.19515
1973	1581.85245
1974	1540.85192
1975	1478.31089
1976	1420.72475
1977	1367.48811
1978	1318.56977
1979	1273.60703
1980	1691.16623
1981	2264.03778
1982	2634.28549
1983	3078.21398
1984	3290.152
1985	3264.85889
1986	3216.84014
1987	4191.53109
1988	4282.94431
1989	4297.97148
1990	4324.05279
1991	4472.83625
1992	4818.16888
1993	5267.06205
1994	5578.10206
1995	6383.07895
1996	6826.40901
1997	7620.86669
1998	7753.22503
1999	7373.83117
2000	7544.08971
2001	7179.88222
2002	7371.70155
2003	8548.65318
2004	8594.72134
2005	8462.09038
2006	8432.14045
2007	8616.45824
2008	8593.23089
2009	8843.79267
2010	8809.71127
2011	8776.36017
2012	9223.31069
2013	9841.85982
2014	10242.7958