*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19755
19760
19770
19780
19791
19801
19810
19820
19830
19840
19850
19860
19870
19880
19890
19905
19910
19924
19930
19940
19955
19961
19974
19980
19995
20005
20015
20020
20038
20046
20059
20060
20073
200810
20092
20100
20115
20129
201310
20140
20150
20160
20170
Total103