*Excludes Observations that spanned multiple years

Pre 19703
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19801
19811
19820
19830
19840
19857
198615
198736
1988107
198926
19901
199123
199216
199359
199437
199531
199616
199715
19980
19991
20000
200135
200221
200313
200411
200510
200610
20079
200812
200921
20108
20118
20128
201310
201413
201510
201617
201711
20187
201912
20204
20219
20225
Total660