*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19721
19730
19740
19750
19760
19770
19780
19792
19800
19810
19820
19831
19841
19851
19860
19872
19880
19894
19905
19913
199224
199339
199412
199557
199610
199727
19983
199910
20002
20013
20021
20031
20042
200511
20061
20070
20082
20090
20100
20113
20122
20131
20140
20151
20167
201720
201822
201937
202033
202136
202238
20232
20240
Total428