*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19721
19730
19740
19753
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19870
19880
19890
19904
19911
19924
19930
19941
19955
19963
19974
19984
19991
20000
20010
20020
20036
20044
200511
20061
200710
200815
200922
201020
201117
201221
201322
20148
20158
201612
20172
Total211