*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19822
19833
19840
19856
19866
19875
198831
198911
199020
19919
199216
199340
199414
199517
199635
199750
19985
19999
200013
20013
200213
20038
200410
20053
20060
20073
20081
20095
201012
201115
20120
20131
20142
201531
20168
201753
20180
Total463