*Excludes Observations that spanned multiple years

Pre 19700
19701
19710
19722
19730
19740
19750
19760
19770
19781
19790
19800
19810
19821
19831
19840
19851
19862
19874
198834
198925
199041
199193
199231
199350
199444
199533
199620
199738
199831
199912
20006
200119
20028
200344
200444
200542
200616
200723
200820
200919
201028
201138
201242
201341
201441
201543
201641
201739
20180
Total1019