solar energy time line

Main

1860
1921 - 1922
1969 - 1970
1974 - 1975
1981 - 1982
1983 - 1984
1989 - 1990
1991 - 1992
1995 - 1996
2000 - 2001
2001 - 2002
2007 - 2008
2013 - 2014

meanwhile

2001 - 2002