*Excludes Observations that spanned multiple years

Pre 19701
19700
19713
19722
19730
19740
19750
19761
19770
19781
19791
19802
19810
19823
19830
19841
19852
19861
19875
19886
198913
199033
1991105
199230
199341
199426
199529
199639
199746
199842
199917
20006
200111
200213
20032
20044
20054
20069
20074
200812
20097
20100
20111
201254
20131
20140
20150
20168
20172
20180
Total588