How fast does a Sweet Olive grow?

Question:I have planted 2 Sweet olive bushes in my new flower beds and they seem to be growing but very slowly. How fast do they generally grow?

Answers:
Growth Rate
Extremely Slow Growing
Growth Habit
Erect
Heat Zones
High:
12 (>210 days)
Low: 1 (< 1 days)
Cold Hardiness
High: 11 (Above 40 F) (see map)
Low: 8 (10 to 20 F)
Water Requirements
Water regularly, when top 3 in. of soil is dry.
Sun Exposure
Full sun