added time axes; cleaned up axes and label;
share common svg;
added rule; put style in css file;
four rules;
added data labels that move with rules in the x direction; need to move them in the y direction also;
highlight current rule;
changed rule opacity;
fixed data label bug;
can print data label for each line chart correctly; need to adjust the y position;
adjusted y pos of retail data labels; need to fix years with missing data;
fixed data labels for years with missing data; need to code data labels for farm;
added data labels for farm prices; need to do the same for percentages;
added data labels for percentages;
formatted (rounded) all data labels to the desired precision;
replaced numbers with macros;
added table in the bottom;