*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197227
19737
19740
19751
19761
19770
19781
19790
19800
19810
19821
19830
19844
198513
198647
198727
198851
198914
199058
199185
199244
199325
19949
19958
19963
19977
199814
199965
200066
200129
200213
20038
200410
20056
20068
200710
20086
200915
20106
201126
201220
201318
201418
201524
201625
201728
20180
Total848