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:
| Map number | English name | Finnish name | Swedish name | Residence city | Dates of existence | Notes |
| --- | --- | --- | --- | --- | --- | --- |
| 14.0 | Province of Nyland and Tavastehus | Uudenmaan ja Hämeen lääni | Nylands och Tavastehus län | Helsinki / Hämeenlinna | 1634–1831 | • one of the original provinces formed in 1634 |
| 18.0 | Province of Ostrobothnia | Pohjanmaan lääni | Österbottens län | Oulu / Vaasa | 1634–1775 | • one of the original provinces formed in 1634 |
| 20.0 | Province of Viborg and Nyslott | Viipurin ja Savonlinnan lääni | Viborgs och Nyslotts län | Vyborg | 1634–1721 | • one of the original provinces formed in 1634 |
| 21.0 | Province of Kexholm | Käkisalmen lääni | Kexholms län | Kexholm | 1634–1721 | • one of the original provinces formed in 1634 |
| 19.0 | Province of Kymmenegård and Nyslott | Savonlinnan ja Kymenkartanon lääni | Kymmenegårds och Nyslotts län | Lappeenranta | 1721–1747 | • former Province of Viborg and Nyslott |
| 17.0 | Province of Savolax and Kymmenegård | Kymenkartanon ja Savon lääni | Savolax och Kymmenegårds län | Loviisa | 1747–1775 | • former Province of Kymmenegård and Nyslott |
| 10.0 | Province of Oulu | Oulun lääni | Uleåborgs län | Oulu | 1775–2009 | • split off from the Province of Ostrobothnia |
Question:
What is the highest value for map number?
Answer:
21.0