*Excludes Observations that spanned multiple years

Pre 197088
1970227
1971254
1972262
197380
1974136
1975120
1976104
1977302
1978234
1979255
1980607
1981180
1982605
1983163
1984195
1985191
198656
198776
1988104
198948
1990109
199176
199248
199398
199452
199550
199663
199765
199862
199954
200047
200137
200266
200357
200450
2005108
200677
2007552
2008188
2009203
2010127
2011150
2012161
2013760
2014103
2015241
2016386
201743
201862
2019112
202042
202129
202269
202340
20243
Total8677