Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Period | Live births per year | Deaths per year | Natural change per year | CBR* | CDR* | NC* | TFR* | IMR* | Life expectancy total | Life expectancy males | Life expectancy females |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1950-1955 | 70 000 | 14 000 | 56 000 | 44.3 | 8.9 | 35.4 | 6.50 | 73.0 | 62.6 | 60.5 | 64.6 |
| 1955-1960 | 76 000 | 15 000 | 61 000 | 42.7 | 8.6 | 34.1 | 6.50 | 70.0 | 63.2 | 61.1 | 65.1 |
| 1960-1965 | 84 000 | 16 000 | 68 000 | 41.3 | 8.0 | 33.3 | 6.45 | 62.0 | 64.3 | 62.3 | 66.3 |
| 1965-1970 | 92 000 | 18 000 | 74 000 | 39.5 | 7.6 | 31.8 | 6.15 | 59.0 | 65.0 | 63.0 | 66.9 |
| 1970-1975 | 94 000 | 19 000 | 75 000 | 35.6 | 7.1 | 28.6 | 5.35 | 53.0 | 65.9 | 63.7 | 68.0 |
| 1975-1980 | 108 000 | 21 000 | 87 000 | 36.1 | 6.9 | 29.2 | 5.20 | 51.0 | 66.5 | 64.3 | 68.7 |
| 1980-1985 | 129 000 | 24 000 | 105 000 | 37.3 | 6.8 | 30.4 | 5.20 | 49.0 | 67.0 | 64.9 | 69.3 |
| 1985-1990 | 139 000 | 26 000 | 113 000 | 34.9 | 6.6 | 28.3 | 4.77 | 47.0 | 67.6 | 65.4 | 69.9 |
| 1990-1995 | 145 000 | 28 000 | 117 000 | 32.0 | 6.2 | 25.8 | 4.31 | 43.0 | 68.5 | 66.3 | 70.8 |
| 1995-2000 | 148 000 | 30 000 | 118 000 | 29.3 | 5.9 | 23.3 | 3.88 | 39.0 | 69.4 | 67.2 | 71.7 |
| 2000-2005 | 151 000 | 32 000 | 119 000 | 26.9 | 5.6 | 21.3 | 3.48 | 36.0 | 70.7 | 68.7 | 72.9 |
Question:
How many imr* have tfr* of 4.31?
Answer:
43.0