*Excludes Observations that spanned multiple years

Pre 197022
19702
19711
19720
19730
19740
19752
19760
19770
19780
19791
19801
19810
19820
19830
19846
19859
198638
198723
198823
198953
199031
199139
199217
199395
199434
19954
199628
19973
19981
19992
200019
200117
200210
200318
200411
200522
20068
200712
200812
200914
201016
201112
201214
201312
201416
201518
201610
20177
20180
20190
Total683