请阅读下面这张Markdown格式的表格并回答问题。同一行中不同列的单元格用'|'分隔，不同行的单元格用'
'分隔。

表格标题:
158图表69： 航运：海外可比公司估值表 
表格:
| 公司名称 | 代码 | 后缀 | 评级 | 市值(USDmn) | PE17 | PE18E | PE19E | PB17 | PB18E | PB19E | ROE17 | ROE18E | ROE19E | yield17 | yield18E | yield19E |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 马士基航运 | MAERSKB | DC | NR | 27682.0 | 22.9 | 17.5 | 20.7 | 0.9 | 0.9 | 0.9 | 3.9 | 3.0 | 4.2 | 1.8 | 2.4 | 2.8 |
| 赫伯罗特航运 | HLAG | GR | NR | 5929.0 | 157.9 | 159.6 | 23.6 | 0.9 | 0.9 | 0.8 | 0.5 | 0.7 | 5.2 | 1.9 | 1.6 | 2.5 |
| 长荣海运 | 2603 | TT | NR | 1556.0 | 6.1 | 132.6 | 20.6 | 0.8 | 0.8 | 0.7 | 12.2 | 1.3 | 5.5 | 1.7 | 0.8 | 2.4 |
| 阳明海运 | 2609 | TT | NR | 622.0 | 48.6 | 2.9 | 7.3 | 0.7 | 1.0 | 1.4 | 1.5 | 29.5 | 10.3 | 0.0 | 0.0 | 2.0 |
| 万海航运 | 2615 | TT | NR | 1099.0 | 13.3 | 18.9 | 30.0 | 1.0 | 0.9 | na | 7.5 | na | na | 3.3 | na | na |
| 珍宝航运 | PSL | TB | NR | 501.0 | 132.5 | 30.0 | 16.8 | 1.3 | 1.3 | 1.3 | 1.0 | 4.1 | 8.4 | 0.0 | 0.9 | 2.6 |
| 商船三井 | 9104 | JP | NR | 2799.0 | 60.2 | 25.0 | 10.5 | 0.6 | 0.5 | 0.6 | 0.9 | 2.2 | 5.0 | 0.8 | 0.9 | 1.6 |
| Scoprio船舶 | SALT | US | NR | 440.0 | 7.0 | 65.5 | 9.1 | 0.5 | 0.5 | 0.5 | 6.4 | 0.8 | 3.9 | 0.3 | 1.3 | 2.7 |
| 黛安娜船舶 | DSX | US | NR | 364.0 | 0.6 | 22.8 | 5.3 | 0.6 | 0.5 | 0.5 | 66.7 | 1.9 | 7.8 | 0.0 | 0.0 | 5.7 |
| Navios海事 | NM | US | NR | 61.0 | 0.3 | 0.5 | 1.1 | 0.1 | na | na | 36.7 | 16.1 | 10.2 | 30.7 | na | na |
问题:
你好，请问市值大于1000亿的公司有多少个
Answer:
5