*Excludes Observations that spanned multiple years

Pre 19707
19700
19710
19720
19730
19741
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19852
19863
198731
198876
198911
19903
199143
199214
199312
19943
199533
19968
199722
19981
19998
200015
20011
20025
20030
20042
20050
20062
20071
20089
200910
20102
20111
20121
20131
20142
20155
20164
20173
20185
20196
20208
202114
20228
20236
20240
Total390