*Excludes Observations that spanned multiple years

Pre 197027
19701
19712
1972244
197383
19740
19751
19761
19770
19782
19794
19806
19812
19821
198312
198442
198522
1986166
1987216
1988653
1989741
1990222
1991497
1992244
1993522
1994221
1995252
1996506
1997425
1998115
199987
2000125
2001140
200273
2003268
2004350
2005380
2006273
2007292
2008330
2009282
2010304
2011284
2012275
2013266
2014287
2015271
2016280
2017222
20181
Total10020