*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
19904
19911
199210
19935
19941
19954
199610
19974
19984
19998
20007
200112
20029
200319
200418
200523
200621
20076
200844
20096
20105
20117
20125
20139
20140
20150
20160
20170
Total242