*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19891
19901
19911
19921
19930
19944
19954
19969
199732
199843
199949
200020
200130
200227
200325
200425
200527
200630
200741
200816
200936
201058
201150
201251
201337
201441
201537
20160
20170
20180
Total697