*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
19870
19881
19890
19901
19911
19923
19934
199417
19953
19966
19970
19981
19992
20000
20011
20020
20031
20040
20050
20061
20073
20082
20095
201019
20118
201213
20135
20147
20157
20165
20170
20180
20190
20200
20210
20220
Total117