*Excludes Observations that spanned multiple years

Pre 19703
19700
19711
197237
197312
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19843
19855
198611
198737
198818
198920
1990104
1991107
199228
199366
199412
199521
19967
19977
19983
199912
200022
20014
20029
20039
200423
200521
200611
20074
200818
20098
201040
201197
201213
201314
201420
201510
201619
201724
20180
Total881