*Excludes Observations that spanned multiple years

Pre 19702
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
198844
19890
19900
19915
19922
199310
19946
19954
19965
19970
19983
19992
200018
200120
200219
20030
200432
20050
20067
20073
200830
200933
20102
20112
20126
20135
20141
20152
20165
20172
20185
20193
20200
20215
20222
20234
20241
Total292