*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19751
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19931
19940
19950
19961
19972
19983
19995
200010
200119
200222
200323
200431
2005115
200691
200717
200822
200934
201024
201135
20123
20134
20140
201522
20160
20170
20180
Total487