The main trend is that all grades including kindergarten is growing for every year
Kindergarten started highest at 2.4 and ended highest at 2.9 percent with a constant increase
But grades 1 - 2 and grades 5- 6 shows a little different trend, both starts at 1,5 percent in 1999 and declines a little bit in 2000
Both of them increased slowly in 2002 and both it holds that course to 2004 where grades 1 - 2 ends at 2,1 percent and grades 5 - 6 ends at 2.6 percent