*Excludes Observations that spanned multiple years

Pre 19704
19700
19711
19720
19730
19740
19750
19760
19772
19781
19790
19800
19810
19820
19830
19840
198521
198612
198747
198837
19894
19901
199160
199212
199377
199434
199558
199615
199717
19980
19995
200012
200112
20022
200313
200413
200512
200610
200710
20089
200918
201014
201115
201216
201313
201412
201514
201613
201712
20189
201911
202010
20217
20227
20239
20248
Total689