*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
200132
200263
200340
200442
200567
200640
2007479
2008153
2009182
2010108
2011114
2012132
2013726
201438
2015195
2016318
20174
Total7570