Year	Measure
1800	379.9
1820	387.9
1913	864.6
1950	1694
1973	2627
1990	2539
1991	2304
1992	1965
1993	1663
1994	1330
1995	1245
1996	1314
1997	1424
1998	1434
1999	1466
2000	1528
2001	1592
2002	1574
2003	1659
2004	1754
2005	1728
2006	1762
2007	1897
2008	2018
2009	2050
2010	2018
2011	2118
2012	2078
2013	2209
2014	2351
2015	2452
2016	2548
2017	2648
2018	2752