*Excludes Observations that spanned multiple years

Pre 19703
19700
19712
197285
197346
19740
19750
19760
19771
19782
19792
19800
19810
19822
19830
19843
19850
19867
198725
1988216
198928
199036
199150
199265
199380
199412
199575
199618
199719
19984
19990
20000
200115
20024
20035
20048
20052
20063
20071
200815
200910
20100
20116
20124
20131
20144
20155
201612
20178
20188
20193
20201
Total896