*Excludes Observations that spanned multiple years

Pre 19700
19701
19710
19720
19730
19740
19751
19764
19774
19780
19792
19802
19810
19820
19830
19840
19852
19866
19871
198820
19890
19900
19915
19924
19932
199411
19958
19962
19976
19983
19998
20001
20010
20026
20035
20040
20051
20063
20070
20088
20094
201011
20117
20121
20139
20142
20150
20160
201717
201830
201923
20200
20210
20220
Total220