Table:
text: Michael W. Smith discography
Albums
Studio albums
Year_ Album Peak_US Peak_US_Holiday Certifications_sales_threshold_
1998 Christmastime ,  , Released: October 13, 1998 , Label: Reunion , Format: CD 90 4 RIAA: Gold
1999 This Is Your Time ,  , Released: November 23, 1999 , Label: Reunion , Format: CD 21 — RIAA: Gold

text: Michael W. Smith discography
Albums
Studio albums
Year_ Album Peak_US Peak_US_Holiday Certifications_sales_threshold_
1990 Go West Young Man ,  , Released: October 1, 1990 , Label: Reunion , Format: CD 74 — RIAA: Platinum , MC: Gold
1992 Change Your World ,  , Released: September 1, 1992 , Label: Reunion , Format: CD 86 — RIAA: Platinum
1995 I`ll Lead You Home ,  , Released: August 29, 1995 , Label: Reunion , Format: CD 16 — RIAA: Platinum
1998 Live the Life ,  , Released: April 28, 1998 , Label: Reunion , Format: CD 23 — RIAA: Gold

Question: How many songs from Michael W. Smith's discography have been performed since 1998?