*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19771
19781
19790
19801
19813
19822
19833
19843
19853
19860
19873
19882
19894
19907
19912
19924
19937
19942
19956
19966
19975
19986
19995
20006
20014
20026
20035
200410
200520
200618
200716
200815
200916
201014
201113
201211
201311
201411
201523
20160
20170
20180
Total276