*Excludes Observations that spanned multiple years

Pre 197057
197010
19710
197231
197381
1974248
1975192
1976152
197774
1978121
197989
1980144
1981124
1982114
1983184
1984382
1985210
1986175
198767
1988100
1989169
1990186
1991121
1992191
1993227
1994160
1995205
1996165
1997119
1998192
1999207
2000187
2001211
2002315
2003230
2004240
2005260
2006328
2007305
2008419
2009392
2010406
2011252
2012267
2013217
201412
201562
2016443
20179
20180
Total9052