*Excludes Observations that spanned multiple years

Pre 1970656
1970120
197111
197224
197312
19748
197549
19768
197751
197854
197943
1980117
198111
198215
19836
19843
19858
19865
19872
19883
19891
19903
19913
199210
199318
199419
199516
19967
19975
19985
199931
200011
200112
2002245
2003335
20041789
2005483
2006501
2007150
2008220
2009613
2010357
2011125
201295
201396
201426
201529
20161
20170
Total6412