*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19751
19760
19770
19781
19794
19800
19810
19820
19830
19841
19856
19865
19873
198825
198910
19901
19916
199228
199396
19949
199522
199610
199737
19983
19991
20001
20013
20021
20031
20046
20052
20062
20071
200823
200912
20109
20115
20120
20138
20145
20153
20165
20176
20185
201910
202019
20212
20229
202313
20243
Total424