*Excludes Observations that spanned multiple years

Pre 19704
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
19992
20000
200135
200221
200313
200411
200511
200610
200711
200812
200921
20108
20119
20129
201311
201414
201510
201618
201712
20188
201915
20204
202114
202216
202314
20243
Total708