*Excludes Observations that spanned multiple years

Pre 19706
19701
19711
19720
19730
19740
19751
19761
19773
19782
19790
19801
19810
19820
19831
19843
198510
198636
19876
198810
198966
199055
199162
199241
199395
199427
199540
199676
199748
199823
199915
200043
200124
200216
200324
200419
200531
200626
200712
200815
200921
201023
201115
201215
201317
201421
201521
201620
201712
20180
20190
Total1005