*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19752
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19906
19915
199216
19935
19947
199510
19962
19977
19984
19996
200013
200115
200213
200334
200426
200525
20067
20077
20089
20095
20103
20115
20129
20132
20140
20150
20160
20170
Total243