*Excludes Observations that spanned multiple years

Pre 19701
19700
19713
19720
19730
19740
19750
19760
19770
19781
19790
19800
19811
19820
19836
19840
19850
198620
19872
19880
19891
19903
19912
199221
199312
19945
199519
19961
199712
19980
199976
200069
200159
200212
20033
200414
20057
20063
20073
20086
20095
20103
20114
20125
20134
20145
20157
201614
201735
20180
Total444