*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197218
19733
19740
19750
19760
19770
19781
19790
19800
19810
19820
19836
198415
198515
198641
198735
198892
198920
199071
199196
199273
199339
199413
199530
19969
199724
199834
199939
200037
200130
20029
200323
20047
200513
200610
20077
200812
200914
201011
201112
20128
20138
20149
20158
201623
201715
20181
20190
Total931