*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19911
19923
19930
19940
19953
19963
19970
19981
19998
200011
20017
20022
20037
200412
200512
20060
20075
20086
20093
20100
20117
201210
201312
20140
20150
20160
20170
Total115