*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19890
19900
19910
19920
19932
19945
19959
19965
19970
19980
19991
20000
20010
20020
20033
20041
20051
20064
20074
20081
20092
20107
20115
201255
20132
20143
20152
20162
20173
20180
Total120