there is a chart which illustrate the number of softwoods and hardwoods in new south wales, australia from 1990 to 1998, which was divided into five short periods.
as we can see from the diagram, the number of softwoods increased steadily from the period of 1990-1991 to the period of 1996-1997, peaking at x1, and then decreased slightly in 1998. however, there was a slight increase in the number of hardwoods at the first three periods. by 1996 this trend continued to climb up at a quicker rate especially from 1997 to 1998 and reached a peak at x2.
obviously, the number of the hardwoods went up dramatically during the whole period while the corresponding data of the softwoods fluctuate slightly. i rather say, both the numbers of hardwoods and softwoods went up gradually the first 7 years, while softwoods come down to the level similar to that of the year before, noticeably, hardwoods multiplied its number to more than two time in 1998 than one year before