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:
| College | 2007 Headcount | 2007-2008 credit hours | County population 18 yrs+ | Penetration in terms of Enrollment per 1000 adults | In-county tuition per credit hour (fall 2009) |
| --- | --- | --- | --- | --- | --- |
| Atlantic | 6929.0 | 143971.0 | 282593.0 | 25.0 | $93 |
| Bergen | 15057.0 | 314497.0 | 698248.0 | 22.0 | $107 |
| Brookdale | 14026.0 | 301583.0 | 487434.0 | 29.0 | $115 |
| Burlington | 8432.0 | 176654.0 | 343108.0 | 25.0 | $97 |
| Camden | 14357.0 | 306397.0 | 385340.0 | 38.0 | $93 |
| Cumberland | 3528.0 | 72555.0 | 117520.0 | 30.0 | $94 |
| Essex | 10995.0 | 264838.0 | 577744.0 | 19.0 | $104 |
| Gloucester | 6169.0 | 120939.0 | 218629.0 | 28.0 | $81 |
| Hudson | 7017.0 | 152108.0 | 467214.0 | 15.0 | $96 |
| Mercer | 8987.0 | 177132.0 | 281218.0 | 32.0 | $119 |
| Middlesex | 12131.0 | 2723.0 | 607262.0 | 20.0 | $97 |
| Morris | 6330.0 | 176825.0 | 371779.0 | 22.0 | $105 |
| Ocean | 9351.0 | 189838.0 | 434393.0 | 22.0 | $94 |
| Passaic | 7261.0 | 131992.0 | 364857.0 | 21.0 | $95 |
| Raritan | 6498.0 | 124504.0 | 242657.0 | 27.0 | $96 |
| Salem | 1270.0 | 29165.0 | 50889.0 | 26.0 | $93 |
| Sussex | 3732.0 | 71325.0 | 114750.0 | 33.0 | $101 |
| Union | 11279.0 | 229044.0 | 383898.0 | 30.0 | $94 |
Question:
What is the biggest number for county population 18 years+?
Answer:
698248.0