*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19772
19781
19790
19800
19811
19821
19831
19840
19850
198611
19871
198820
19890
19900
199132
199221
199344
19948
19952
19960
19972
19981
199919
20004
200114
200214
200310
200441
200510
20063
20074
20082
20093
20100
20112
20122
20135
20144
20155
20161
20174
20183
20190
20202
20210
20221
20234
20240
Total307