this is my data i need to creat a scatter plot on execel and approximate the year that penny composition started to changing . i know how to do the plot i just dont know to find approximation . thanks  Year Mass (g) 1990 2.4822 1994 2.5055 2006 2.5914 1991 2.4852 1998 2.5201 1971 3.1439 1984 2.5132 2006 2.4852 1994 2.5076 1979 3.1024 1975 3.0668 1982 3.0776 2001 2.4873 1989 2.532 1974 3.1034 1980 3.0917 2000 2.4921 1977 3.1057 1993 2.5005 1968 3.0943 1982 3.0761 2000 2.5061 1975 3.093 1981 3.1011 2008 2.489 1987 2.5068 1976 3.1 2010 2.4836 1999 2.5458 2007 2.5015 1987 2.5143 1978 3.0798 1995 2.4947 1974 3.0307 1981 3.0939 1992 2.4737 1982 3.935 1972 3.0973 1993 2.4898 1998 2.4951 1991 2.4756 1995 2.5061 1994 2.4949 2007 2.514 1996 2.4905 2001 2.5073 2002 2.4976 2006 2.5118 1996 2.5159 1972 3.0513 1994 2.4941 1990 2.4832 2007 2.4744 2007 2.4804 1976 3.0947 2001 2.5391 1980 3.0076 1995 2.5061 2004 2.5043 1976 3.0985 1962 3.0758 1975 3.1024 1982 3.0568 1989 2.5135 1973 3.0873 1999 2.5202 2005 2.528 1964 3.1936 1980 3.1235 2009 2.4992 1974 3.0576 1995 2.4895 1993 2.4833 1987 2.4777 1983 2.4757 1990 2.4966 1974 3.0052 1992 2.5066 1971 3.1549 2004 2.529 1979 3.9652 1999 2.4958 1987 2.5137 1967 3.1254 1982 3.0805 1996 2.4924 2007 2.4956 2004 2.5306 2007 2.4772 1989 2.5218 1988 2.5234 2010 2.4983 1980 3.0857 1976 3.103 1977 3.0167 2000 2.48 1996 2.5113 1995 2.5181 1996 2.4888 1977 3.0524

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