TABLE 16-6 $$\text { The number of cases of merlot wine sold by a Paso Robles winery in an 8-year period follows. }$$

TABLE 16-6
$$\text { The number of cases of merlot wine sold by a Paso Robles winery in an 8-year period follows. }$$ $$\begin{array} { c c } \underline { \text { Year }} &\underline {\text { Cases of Wine }}\\ 1991 & 270 \\1992 & 356 \\1993 & 398 \\1994 & 456 \\1995 & 358 \\1996 & 500 \\1997 & 410 \\1998 & 376\end{array}$$

-Referring to Table 16-6, a centered 5-year moving average is to be constructed for the wine sales. The moving average for 1993 is ____.