*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19791
19800
19810
19820
19830
19840
19850
19860
19872
19882
19894
19903
199111
19924
19935
19947
19953
199610
199711
19980
19990
20000
20010
20021
20037
20047
20053
20063
20070
20081
20091
201011
20112
20122
20135
20140
20151
20162
20171
20182
20190
20200
20210
20220
20230
20240
Total113