My example is:
\documentclass[12pt]{article}
\usepackage[margin=1in]{geometry}
\usepackage{tabulary}
\setlength{\tymin}{0.08\textwidth}
\setlength\extrarowheight{2pt}
\makeatletter
\def\z#14#2!!{\def\TY@classz{#17#2}}
\expandafter\z\TY@classz!!
\makeatother
\begin{document}
\begin{tabulary}{\textwidth}{p{9em}RRRRRRR}
\hline
& Ribeir\~{a}o Preto-Paul\'{i}nia & Uberaba-Ribeir\~{a}o Preto
& Itumbiara-Uberaba & Quirin\'{o}polis-Itumbiara
& Jata\'{i}- Quirin\'{o}polis & Anhembi-Paul\'{i}nia & Total \\
\hline
NPV (US\$ million)
& 230
& 281
& 49.9
& -133
& -69.1
& 134
& 492 \\%$
Construction Emissions (million Mg CO${}_2$eq)
& 0.069
& 0.035
& 0.053
& 0.023
& 0.016
& 0.011
& 0.21 \\%$
Annual Net Avoided Operating Emissions (million Mg CO${}_2$eq)\textsuperscript{a}
& 0.27
& 0.14
& 0.17
& 0.03
& 0.016
& 0.043
& 0.67 \\%$
Cumulative Avoided GHG Emissions (million Mg CO${}_2$eq)\textsuperscript{b}
& 7.94
& 4.07
& 5.12
& 0.866
& 0.474
& 1.29
& 19.8 \\
NPV of Cumulative Avoided Emissions (US\$ million)\textsuperscript{c}
& 248
& 127
& 160
& 27
& 14.7
& 40.1
& 617 \\%$
\hline
\end{tabulary}
\end{document}
That results in the following:

There is left over white space around the second column with overlapping content in the final five. Any ideas as to how to fix this? Thanks so much.
