*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19751
19760
19771
19780
19790
19800
19810
19820
19830
19842
19851
19860
19874
19882
19892
199011
19912
19923
19937
19940
19950
19961
19972
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20121
20132
20140
20150
20160
20170
Total44