*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19751
19760
19770
19781
19790
19800
19810
19822
19833
19840
19856
19866
19875
198832
198911
199022
19919
199216
199340
199414
199518
199636
199750
19986
19999
200013
20013
200214
200310
200411
20054
20062
20073
20081
20097
201012
201115
20120
20131
20144
201532
201616
201753
20181
Total491