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:
| Ethnic group | 2001 population | 2001 % | 2011 population | 2011 % |
| --- | --- | --- | --- | --- |
| White: British | 42747136.0 | 87.0 | 42279236.0 | 79.8 |
| White: Irish | 624115.0 | 1.3 | 517001.0 | 1.0 |
| White: Other | 1308110.0 | 2.7 | 2430010.0 | 4.6 |
| White : Total | 44679361.0 | 91.0 | 45281142.0 | 85.4 |
| Asian or Asian British: Indian | 1028546.0 | 2.1 | 1395702.0 | 2.6 |
| Asian or Asian British: Pakistani | 706539.0 | 1.4 | 1112282.0 | 2.1 |
| Asian or Asian British: Bangladeshi | 275394.0 | 0.6 | 436514.0 | 0.8 |
| Asian or Asian British: Chinese | 220681.0 | 0.5 | 379502.0 | 0.7 |
| Asian or Asian British: Asian Other | 237810.0 | 0.5 | 819403.0 | 1.6 |
| Asian or Asian British : Total | 2468970.0 | 5.1 | 4143403.0 | 7.8 |
| Black or Black British: Caribbean | 561246.0 | 1.1 | 591016.0 | 1.1 |
| Black or Black British: African | 475938.0 | 1.0 | 977741.0 | 1.8 |
| Black or Black British: Other | 95324.0 | 0.2 | 277857.0 | 0.5 |
| Black or Black British : Total | 1132508.0 | 2.3 | 1846614.0 | 3.5 |
| Mixed: White and Caribbean | 231424.0 | 0.5 | 415616.0 | 0.8 |
| Mixed: White and African | 76498.0 | 0.2 | 161550.0 | 0.3 |
| Mixed: White and Asian Other | 184014.0 | 0.4 | 332708.0 | 0.6 |
| Mixed: Other Mixed | 151437.0 | 0.3 | 283005.0 | 0.3 |
| British Mixed : Total | 643373.0 | 1.4 | 1192879.0 | 2.0 |
| Other: Any other ethnic group | 214619.0 | 0.4 | 327433.0 | 0.6 |
| Other: Total | 214619.0 | 0.4 | 548418.0 | 1.0 |
Question:
What is the highest 2001 population when the ethnic group is white: british?
Answer:
42747136.0