*Excludes Observations that spanned multiple years

Pre 1970136
197016
19715
19725
19737
197410
19757
197613
19777
197824
197936
198027
198130
198234
198375
198471
198588
1986185
1987191
1988199
1989201
1990174
1991245
1992245
1993225
1994261
1995334
1996340
1997511
1998381
1999473
2000598
2001579
2002497
2003784
2004777
2005783
2006917
20071439
20081147
2009988
20101206
2011769
2012771
2013853
201489
20150
20160
20170
Total16753