*Excludes Observations that spanned multiple years

Pre 1970168
197016
19714
197216
197381
1974307
1975373
1976267
197788
1978146
1979127
1980118
1981109
198276
1983210
1984411
1985196
1986210
1987199
1988246
1989223
1990216
1991201
1992182
1993172
1994192
1995210
1996218
1997295
1998233
1999258
2000286
2001249
2002341
2003280
2004275
2005323
2006220
2007241
2008304
2009346
2010335
2011323
2012186
2013179
201422
20150
20160
20170
Total9678