Platzhalter für fehlende Zahl bei einer Statistik mit pgfplots

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\begin{filecontents*}{GDP.csv}
    Jahr,Vereinigte Staaten,United Kingdom,Denmark,Finland,Iceland,Norway,Sweden,Germany,EU28
    1990-01-01,1.9,0.7,1.5,0.7,1.2,1.9,0.8,5.3,..
    1991-01-01,-0.1,-1.1,1.4,-5.9,-0.2,3.1,-1.1,5.1,..
    1992-01-01,3.6,0.4,2.0,-3.3,-3.4,3.6,-1.2,1.9,..
    1993-01-01,2.7,2.5,0.0,-0.7,1.3,2.8,-2.1,-1.0,..
    1994-01-01,4.0,3.9,5.3,3.9,3.6,5.1,4.1,2.5,..
    1995-01-01,2.7,2.5,3.0,4.2,0.1,4.2,4.0,1.7,..
    1996-01-01,3.8,2.5,2.9,3.7,4.8,5.0,1.5,0.8,1.9
    1997-01-01,4.5,4.0,3.3,6.3,5.5,5.3,2.9,1.8,2.9
    1998-01-01,4.4,3.1,2.2,5.4,7.0,2.6,4.2,2.0,3.0
    1999-01-01,4.7,3.2,2.9,4.4,3.9,2.0,4.5,2.0,3.0
    2000-01-01,4.1,3.7,3.7,5.6,4.6,3.2,4.7,3.0,3.8
    2001-01-01,1.0,2.5,0.8,2.6,3.9,2.1,1.6,1.7,2.2
    2002-01-01,1.8,2.5,0.5,1.7,0.6,1.4,2.1,0.0,1.4
    2003-01-01,2.8,3.3,0.4,2.0,2.4,0.9,2.4,-0.7,1.3
    2004-01-01,3.8,2.4,2.7,3.9,8.1,4.0,4.3,1.2,2.5
    2005-01-01,3.3,3.1,2.3,2.8,6.4,2.6,2.8,0.7,2.1
    2006-01-01,2.7,2.5,3.9,4.1,5.0,2.4,4.7,3.7,3.3
    2007-01-01,1.8,2.4,0.9,5.2,9.4,3.0,3.4,3.3,3.0
    2008-01-01,-0.3,-0.5,-0.5,0.7,1.7,0.5,-0.6,1.1,0.4
    2009-01-01,-2.8,-4.2,-4.9,-8.3,-6.5,-1.7,-5.2,-5.6,-4.3
    2010-01-01,2.5,1.7,1.9,3.0,-3.6,0.7,6.0,4.1,2.1
    2011-01-01,1.6,1.5,1.3,2.6,2.0,1.0,2.7,3.7,1.7
    2012-01-01,2.2,1.5,0.2,-1.4,1.3,2.7,-0.3,0.5,-0.4
    2013-01-01,1.7,2.1,0.9,-0.8,4.3,1.0,1.2,0.5,0.3
    2014-01-01,2.4,3.1,1.6,-0.6,2.1,2.0,2.6,1.9,1.8
    2015-01-01,2.6,2.3,1.6,0.0,4.3,2.0,4.5,1.7,2.3
    2016-01-01,...,1.8,2.0,1.9,7.4,1.1,3.2,1.9,1.9
    \end{filecontents*}
    \documentclass[tikz]{standalone}
    \usepackage{pgfplots}
    \usepgfplotslibrary{dateplot}
    \begin{document}
    \sffamily
    \begin{tikzpicture}
        \sffamily
          \begin{axis}[
          date ZERO=1990-01-01,
            date coordinates in=x,
            no marks,
 
 
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