1990

6.6

1989

5.8

2006

6.7

1987

7.4

1998

6.4

1994

5.5

2015

6.1

1993

7.9

10.0

2019

8.2

2013

9.5

2015

7.8

1991

1.0

2001

6.6

1999

8.4

2000

0.0

1966

6.4

2015

7.3

2004

8.0

2004

8.3