*Excludes Observations that spanned multiple years

Pre 197059
197010
19710
197212
197372
1974288
1975372
1976262
197772
1978142
1979120
1980106
198187
198272
1983193
1984370
1985191
1986106
1987108
198894
1989108
1990113
199171
199285
199389
199489
1995104
199681
199793
1998107
1999102
2000104
200198
2002134
2003146
200492
2005116
2006151
2007144
2008141
2009173
2010223
2011176
2012160
2013183
201419
20150
20160
20170
Total5838