*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19761
19772
19782
19790
19800
19810
19820
19831
19840
19851
19860
19870
19883
19896
19905
19917
199212
199314
19944
199536
199647
199747
199823
199914
200025
20011
20026
20038
20042
20058
200610
20070
20080
20092
20100
20110
20121
20130
20141
20150
20160
20170
Total290