*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19933
19940
19950
19960
19970
19980
19993
20000
20010
20021
20034
20043
20054
200616
20077
200829
200914
201011
20113
20124
201310
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total112