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:
| Tournament | Also currently known as | City(s) | Country | Court surface | Tier IV in | Years |
| --- | --- | --- | --- | --- | --- | --- |
| Rome | Internazionali BNL d'Italia | Rome | Italy | Clay | 1988 | 1.0 |
| Zurich | Zurich Open | Zurich | Switzerland | Hard (i) | 1988 | 1.0 |
| Hamburg | Rexona Cup | Hamburg | Germany | Clay | 1988–1989 | 2.0 |
| New Jersey | United Jersey Bank Classic | Mahwah , NJ | United States | Hard | 1988–1989 | 2.0 |
| Newport | Virginia Slims of Newport | Newport , RI | United States | Clay | 1988–1989 | 2.0 |
| San Antonio | Pilot Pen Tennis | San Antonio , TX | United States | Hard | 1988–1989 | 2.0 |
| San Diego | San Diego Open | San Diego , CA | United States | Hard | 1988–1989 | 2.0 |
| Sydney | Medibank International Sydney | Sydney | Australia | Grass (1988) Hard (1989) | 1988–1989 | 2.0 |
| Tampa | Eckerd Open | Tampa , FL | United States | Clay | 1988–1989 | 2.0 |
| Puerto Rico Open | Honda Classic | San Juan (1988–1989, 1991–1993) Dorado (1990) | Puerto Rico | Hard | 1988–1993 | 6.0 |
| Kansas | Avon Championships of Kansas | Wichita , KS | United States | Hard | 1990 | 1.0 |
Question:
What is the most years that tournaments held in Rome have lasted?
Answer:
1.0