*Excludes Observations that spanned multiple years

Pre 197060
197010
19714
197225
197330
1974276
1975326
1976231
197792
1978139
1979103
1980169
1981149
1982159
1983276
1984472
1985328
1986216
1987173
1988201
1989346
1990400
1991252
1992375
1993420
1994499
1995488
1996391
1997377
1998419
1999554
2000478
2001785
2002997
2003611
2004824
2005665
2006823
2007838
2008925
2009948
2010814
2011654
2012527
2013372
201455
201512
201629
201716
20180
Total18333