Year	Measure
1971	3128.60199
1972	3224.51944
1973	3343.35449
1974	3464.06609
1975	3539.87937
1976	3631.2608
1977	3780.58945
1978	3929.15703
1979	3967.23813
1980	3983.84277
1981	3872.53656
1982	3754.67958
1983	3767.59667
1984	3932.19243
1985	4015.15217
1986	3979.67418
1987	4074.77905
1988	4106.15043
1989	4083.66222
1990	4024.66907
1991	3606.58244
1992	3410.72788
1993	3334.79435
1994	3260.63182
1995	3315.04799
1996	3364.25879
1997	3361.88402
1998	3256.50253
1999	3271.41393
2000	3292.60901
2001	3456.70547
2002	3483.86751
2003	3468.78367
2004	3416.24785
2005	3504.47559
2006	3469.29139
2007	3320.45472
2008	3405.69297
2009	3106.68617
2010	3306.80554
2011	3213.94977
2012	3080.72503
2013	3130.92657
2014	2943.18916
2015	3003.66422