*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19882
19890
199045
199168
199232
199322
199411
199515
19960
19972
19982
19991
20000
20010
20020
20037
20049
20052
200611
200722
200825
200920
201010
201112
201213
201315
201415
201518
201618
201717
201818
201916
20204
202113
20229
20231
20241
Total478