2003

6.1

1990

6.2

1991

6.8

2014

7.6

2023

6.4

1981

7.1

2007

6.1

2000

6.3

1994

5.7

1986

5.8

1998

7.0

1999

6.8

1998

6.5

2001

6.9

1987

7.3

1989

7.0

1992

6.7

1998

6.6

2014

5.3

2017

5.7