*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19869
19879
19883
19890
19900
19911
19920
19932
19946
19953
19962
19971
19980
19994
20002
20010
20022
20030
20042
20050
20060
20071
200811
20093
20100
20111
20121
201312
20141
20150
20162
20170
20180
20190
20200
20210
20220
Total78