2002

4.8

2015

5.4

2009

7.5

2000

5.8

2002

5.5

1991

7.4

1987

5.1

2000

2.7

1977

3.9

1977

5.8

2013

4.4

2023

6.2

1999

4.9

2018

4.8

2020

0.0

2001

3.3

2019

6.2

1979

6.2

2004

5.6

2007

6.9