*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19751
19761
19772
19782
19790
19800
19810
19820
19831
19840
19851
19862
19870
19885
198940
19905
19918
199212
199373
199426
199540
199675
199748
199823
199915
200025
20011
20026
200324
200419
200531
200626
200712
200814
200921
201023
201114
201215
201317
201421
201521
201620
201712
20180
Total703