Sym454 -8000 -7000 -6000 -5000 -4000 -3000 -2000 -1000 0 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2025 2030 2040 2050 2060 2070 2080 2090 2100 2110 2120 2200 2300 2400 2500 2600 2700 3000 4000 January February March April May June July August September October November December -- starts at 2006-01-02