year	quarter	sales	pdi
1964	1	37.0	109
1964	2	33.5	115
1964	3	30.8	113
1964	4	37.9	116
1965	1	37.4	118
1965	2	31.6	120
1965	3	34.0	122
1965	4	38.1	124
1966	1	40.0	126
1966	2	35.0	128
1966	3	34.9	130
1966	4	40.2	132
1967	1	41.9	133
1967	2	34.7	135
1967	3	38.8	138
1967	4	43.7	140
1968	1	44.2	143
1968	2	40.4	147
1968	3	38.4	148
1968	4	45.4	151
1969	1	44.9	153
1969	2	41.6	156
1969	3	44.0	160
1969	4	48.1	163
1970	1	49.7	166
1970	2	43.9	171
1970	3	41.6	174
1970	4	51.0	175
1971	1	52.0	180
1971	2	46.2	184
1971	3	47.1	187
1971	4	52.7	189
1972	1	52.2	191
1972	2	47.0	193
1972	3	47.8	194
1972	4	52.8	196
1973	1	54.1	199
1973	2	49.5	201
1973	3	49.5	202
1973	4	54.3	204