*Excludes Observations that spanned multiple years

Pre 1970137
19705
19711
19721
19733
19740
19754
19760
19771
19786
19790
19801
19810
19820
19830
19840
198512
19861
19870
19880
19890
19900
19910
19921
19930
19942
19950
19960
19974
19981
19992
20000
20010
20022
20030
20040
20052
200625
20070
20083
200919
201018
201110
20123
201346
20142
20157
20160
20174
20187
20193
20203
20213
20222
20231
20242
Total344