24%
Percentage change is computed as follows. When it is positive, it represents growth or increase. When it is negative, it represents decrease or decline.
... percent change = ((new value) - (old value))/(old value) × 100%
... = (7.3 -5.9)/5.9 × 100%
... = 1.4/5.9 × 100%
... ≈ 0.2373 × 100%
... ≈ 24% . . . . . rounded to nearest whole percent
Since the time difference is 1 year, this is the annual growth rate.