*Excludes Observations that spanned multiple years

Pre 197017
1970222
1971252
1972260
197374
1974133
1975113
1976101
1977297
1978231
1979254
1980604
1981180
1982603
1983162
1984195
1985186
198654
198775
1988103
198942
1990110
199176
199244
199392
199450
199548
199653
199763
199862
199949
200032
200133
200264
200341
200443
200568
200641
2007481
2008155
2009184
2010110
2011130
2012139
2013736
201445
2015202
2016324
201712
20182
Total7647